Spring and power pull-back for hay-balers.



G. SOHUBERT. SPRING AND POWER PULL BACK FOR HAY BALERS. APPLICATIONFILED MAYfi, 1909.

97,151.. Patented Sept. 27,1916.

mm ters GEORGE SCI-IUBERT, OF FORT WORTH, TEXAS.

SPRING AND PO'WER PULL-BACK FOR HAY-BALERS.

To all whom it may concern:

Be it known that I, Gnonen SorIUBnRT, a citizen of the United States,residing at Fort \Vorth, R. F. D. No. 5, in the county of Tarrant andState of Texas, have invented new and useful Improvements in Spring andPower Pull-Backs for Hay-Balers, of which the following is aspecification.

My present invention relates to a hay baler in which the plunger ismoved inward by power and drawn outward by power or by aspring. If aspring is used it is generally arranged to be expanded during the inwardmovement of the plunger, which adds to the heavy energy needed to makethe pressure on the hay; and the heavy back pressure of the compressedmaterial and the power of the spring causes the plunger-bar to kick backwith much force as soon as the center of the roller carried by thepowerhead has passed the center of the plungerbar, or the end of thecam, and as the plunger-bar thus forces its way backward it shifts thesecond half of the roller forward and swings the sweep of the power-headforward correspondingly; which is also very disagreeable to the team andthe operator. I overcome these objections, first: by pivot ing theplunger-bar to an arm pivoted on the extension-beam and provided withcams to be operated on by rollers on a power-head, the first cam to movethe plunger inward and a second cam to move the plunger outward, andsecond: by locating a strong spring in the near end of the second cam,and with its end projecting to be compressed by a roller of thepower-head at the time another roller of said power-head moves aroundthe end of the first cam and prevent the heavy forward swing of thesweep, and also avoid the tensioning of the spring during the time thepressure is needed for the hay.

Figure 1 is a plan View of a power-head and free end of anextension-beam provided with my improved mechanism; showing the springcompressed and the plunger-bar ready to move back. Fig. 2 is a similarview, with the plungerdoar moved back and the spring expanded. Fig. 3 isa side view of the same mechanism. Figs. 4t and 5 are edge and planviews of the arm to operate the plunger-bar. Fig. 6 is an enlarged viewof a washer employed to retain the spring in its position, and Fig. 7 isan enlarged view of the spring.

Specification of Letters Patent.

Application filed May 5, 1909.

Patented Sept. 27, 1910.

Serial No. 494,010.

In the drawings: 11 represents the extension-beam the power end of sameonly bemg shown.

12 is a seat secured on the power end of the extension-beam and providedwith a. per foration 13 and pivot 14, for the purpose later on noted.

15 is an arm having the long cam 16 and the short cam 17, and pivoted byits boss 18 in the perforation 13, above noted; and having pivoted toits swinging end the end of the plunger-bar 19.

20 is a perforation formed in the connecting stock of the cams 1(3 and17 with a slot 22 extending through the upper surface of said stock.

21 is a spring of a size to freely enter the perforation 20, and of alength to project a short distance from said perforation and with a)1'ojecting washer 23 inserted in the larger part of the slot 22 toengage in be tween one of the coils of the spring 21 to prevent thespring 21 disengaging the perforation 20.

2 1 are common washers inserted in the rear end of the perforation 20when so desired.

25 is the usual power-head having the depending rollers 26 26 26 tooperate the arm 15.

27 and 28 are lugs on the power-head to receive the usual sweep, notshown in the drawings.

During the first portion of the rebound the outward movement of theplunger-bar, whether from the power of the compressed spring or from thecompressed hay, is much faster than it can be moved by a cam of propergain; for this reason, the near end of the cam 17, (the end having thespring 21,) is cut back beyond a working gain. The portion or cornernear numeral 17 can be rounded or remain square as shown in Fig. 1. Bycutting away this first part of the cam 17 and depending on the springin said cam or on the rebound from the compressed hay for the firstportion of the outward movement of the plunger-bar the roller of thepower-head will be in contact with the part of the cam having theworking gain at a time that the outward movement of the plunger-bar hasdecreased to about the speed produced by the team and thereby avoidingthe stopping and restarting of the plungerbar during its outwardmovement. The restarting of the plunger-bar and its heavy outwardmovement by the cam is impossible without checking the team, for thisreason it is very essential to cut away the first portion of the cam asabove described and depend on the spring to accomplish the first part ofthe outward movement of the plunger-bar.

In operating the press: The power-head rotated in direction of dottedlines in Fig. 1, and as one roller 26 passes the end of the cam 16 theopposite roller 26 compresses the spring 21 as seen in Fig. 1, thecompressed spring being of ample strength to shift the plunger bar andthe arm 15 back, or at least to the position seen in dotted lines inFig. 1, after which the roller 26 will engage the cam 17 and completethe rearward movement of the arm and plunger-bar to the position seen inFig. 2; the spring 21 expanding again and allowing the washer 23 to restagainst the front end of the slot 22. The tension of the spring 21 canbe varied by the use of common washers 2% in the bottom of theperforation 20.

I claim 1. In a baling press of the kind described, an extension beam, aseat having pivots or perforations and secured on said extension beam, apower-head journaled on the seat, an arm journaled on the seat andhaving pivoted to its swinging end the end of the plunger bar, cams onsaid arm, a spring carried by said arm and engaged by the arms of thepower-head to compress said spring.

2. In a baling press of the kind described, a power-head having arms,rollers on said arms, an arm pivoted within the field of the rollers andhaving pivoted to its swinging end the end of the plunger bar, a maincam on said arm to be engaged by a roller of one of the arms of thepower-head, a spring carried by said arm to be compressed by anotherroller of said power-head during the time the first said roller ispassing the end of the main cam to absorb the forward swing of thepower-head or sweep.

3. In a baling press of the kind described, a power-head, an arm pivotedwithin the field of the power-head, and having pivoted to its swingingend the plunger bar, a main cam on said arm to be engaged by thepower-head, a spring carried by said arm to be compressed by thepower-head to shift the plunger bar back.

4. In a baling press of the kind described, a power-head, an arm pivotedwithin the field of the power-head and having pivoted to its swingingend the end of the plunger bar, a main cam on said arm to be engaged bythe power-head, a spring carried by said arm, said spring to becompressed at a time that the load on the power-head on the main cam isdecreasing.

5. In a baling press of the kind described,

a power-head, rollers on said power-head,

an arm pivoted within the field of the power-head and having pivoted toits swinging end the end of the plunger bar, a main cam on said arm tobe engaged by a roller of the power-head to shift the plunger barinwardly, a spring carried by said arm to be engaged by a second rollerof the power-head and a second cam on said arm to be engaged by saidsecond roller to move the plunger bar outwardly.

6. In a baling press of the kind described, a power-head, rollers onsaid power-head, an arm provided with a perforation or recess andpivoted within the field of the power-head and having pivoted to itsswinging end the end of the plunger bar, a main cam on said arm, aspring in said perforation to shift the plunger bar back or outwardly, aslot extending through the stock of the perforation, a washer extendinginto said slot and engaging said spring to retain said spring in saidperforation.

7. In a baling press of the kind described, a power-head, rollers onsaid power-head, an arm pivoted within the field of the powerhead andhaving pivoted to its swinging end the end of the plunger bar, a maincam on said arm engaged by a roller of the power-head to shift theplunger bar inwardly, a second cam on the said arm engaged by a rollerof the power-head to shift the plunger bar outwardly, the first portionof said second cam being cut away to bring the roller in contact withsaid cam having the working gain at the proper time to pre vent thestopping and restarting of the plunger bar during its outward movement.

8. In a baling press of the kind described, a power-head, rollers onsaid power-head, an arm pivoted within the field of the powerhead andhaving a perforation or recess, a plunger bar pivoted to the swingingend of said arm, a spring in said perforation and engaged by the rollersto shift the plunger bar outwardly.

GEORGE SCHUBERT.

IVitnesses O. G. HARTMAN, FRED STRICKLAND.

